package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.SetmealService;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增购物车
     * @param shoppingCartDTO
     */
    public void add(ShoppingCartDTO shoppingCartDTO) {

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        //判断购物车中是否已经存在该菜品或套餐
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果存在，就修改份数
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {

            //如果不存在，就新增
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                Dish dish = dishMapper.queryById(dishId);
                shoppingCart.setDishId(dishId);
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setName(dish.getName());
                shoppingCart.setDishFlavor(shoppingCartDTO.getDishFlavor());
                shoppingCart.setImage(dish.getImage());

            } else {
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.queryById(setmealId);
                shoppingCart.setSetmealId(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setImage(setmeal.getImage());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查询购物车
     * @return
     */
    public List<ShoppingCart> list() {
        ShoppingCart shoppingCart=new ShoppingCart();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    public void clean() {
        shoppingCartMapper.deleteAll(BaseContext.getCurrentId());
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void delete(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //查询购物车-----套餐或菜品
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        shoppingCart=list.get(0);
        Integer number=shoppingCart.getNumber();
        //如果购物车中该商品数量大于1，就修改数量
        if(number>1){
            shoppingCart.setNumber(number-1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            //如果购物车中该商品数量等于1，就删除该商品
            shoppingCartMapper.delete(shoppingCart);
        }

    }
}
